code: def tearDown(self):
      del self.d1
  
file_path: pgmpy/pgmpy/tests/test_estimators/test_BaseEstimator.py
imports: import unittest
  import numpy
  import pandas
  from pgmpy.estimators import BaseEstimator
label_desc: Use image node_id 4 for calling the TestBaseEstimator obj's underlying member method code with example usage: obj.tearDown() without return types